int day = 4;
String dayName;

switch (day) {
    case 1:
        dayName = "الأحد";
        break;
    case 2:
        dayName = "الاثنين";
        break;
    case 3:
        dayName = "الثلاثاء";
        break;
    case 4:
        dayName = "الأربعاء";
        break;
    case 5:
        dayName = "الخميس";
        break;
    case 6:
        dayName = "الجمعة";
        break;
    case 7:
        dayName = "السبت";
        break;
    default:
        dayName = "يوم غير صالح";
}

System.out.println("اليوم هو " + dayName);

,